A PC adds its constitution modifier to its HP every level. A 13 Constitution Score grants a +1 Constitution modifier. So a level 5 PC with a +1 Con mod will have +5 HP from Con. A 19 Constitution Score grants a +4 Constitution modifier. So a level 5 PC with a +4 Con mod will have +20 HP from Con. That is just RAW, D&D 101.
This error is only occurring when it comes to HP
The Monk has a +20 to her constitution with a constitution score of 19 (Amulet of Health)
The Druid has a +5 to his constitution with a constitution score of 13
The Blood Hunter has a +5 to his constitution with a constitution score of 13
The Fighter has a +20 to his constitution with a constitution score of 18
The Rouge has a +5 to his constitution with a constitution score of 12
They are all only Level 5 and there health is becoming insane
Post links to each of the characters. I suspect an incorrectly programmed homebrew of some sort.
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https://www.dndbeyond.com/profile/LadyDiane99/characters/28377959 - Monk
https://www.dndbeyond.com/profile/Hobert_Fluke/characters/28195748 - Druid
https://www.dndbeyond.com/profile/Zshoes/characters/26823204 - Bloodhunter
https://www.dndbeyond.com/profile/ZannyPhantom/characters/28234531 - Fighter
https://www.dndbeyond.com/profile/Daytona_James/characters/28228205 - Rogue
The monk is level 5 with +4 to con, so the total con bonus for HP is 20 (5*4)
The druid is level 5 with +1 to con, so the total con bonus for HP is 5 (5*1)
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A PC adds its constitution modifier to its HP every level. A 13 Constitution Score grants a +1 Constitution modifier. So a level 5 PC with a +1 Con mod will have +5 HP from Con. A 19 Constitution Score grants a +4 Constitution modifier. So a level 5 PC with a +4 Con mod will have +20 HP from Con. That is just RAW, D&D 101.
Creating Epic Boons on DDB
DDB Buyers' Guide
Hardcovers, DDB & You
Content Troubleshooting